#include <bits/stdc++.h>
using namespace std;
struct Info{
int t, l, m; // time, location, money
bool operator < (const Info &info) const {
return t < info.t;
}
};
int N, U, D, S, DP[5050];
Info A[5050];
int main(){
ios_base::sync_with_stdio(false); cin.tie(nullptr);
cin >> N >> U >> D >> S;
for(int i=1; i<=N; i++) cin >> A[i].t >> A[i].l >> A[i].m;
A[0] = {0, S, 0}; // start
A[++N] = {505050, S, 0}; // end
sort(A+1, A+N+1);
memset(DP, 0xc0, sizeof DP);
DP[0] = 0;
for(int i=1; i<=N; i++){
for(int j=0; j<i; j++){
int unitCost = A[j].l < A[i].l ? D : U, dist = abs(A[j].l - A[i].l);
DP[i] = max(DP[i], DP[j] + A[i].m - unitCost * dist);
}
}
cout << DP[N];
}
